Which two seats are utilized in a dry pipe valve?

In a dry pipe valve, the two seats utilized are known as the wet seat and the dry seat. The wet seat is where the water is present when the water supply is charged, and it serves to hold the water under pressure until the system is activated. The dry seat, on the other hand, is primarily responsible for allowing air to escape from the valve when the system operates. This separation of wet and dry components is crucial because the dry pipe system is designed to remain empty of water until a fire triggers the sprinkler heads, allowing water to flow into the system.

The dry pipe valve operates by maintaining air pressure in the system when not in use, which helps prevent pipe freezing in environments where temperatures drop. When a sprinkler head opens due to heat from a fire, the air pressure drops, allowing the valve to open and water to flow into the dry pipes and subsequently out through the sprinkler heads.

Understanding these terms helps clarify the function of the dry pipe valve and why it is essential in fire protection systems, especially in areas where freezing can be a concern.